stock_list = [['招商银行',0.0124],['兴业银行',0.0111],
            ['中国银行',-0.0078],['宁波银行',0.0036]]
stock_filter = filter(lambda x: x[1] > 0, stock_list)
print(stock_filter)
stock_list = list(stock_filter)
print(stock_list)